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41. [AMPS] Resistors (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 18 Jun 2000 07:26:04 -0700; This sounds like the multiplier resistor for the voltmeter function. It is easy to find 2w 1.5 meg resistors but most of them are rated only for 300 or 500v maximum. I suspect your amp has several th; /archives//html/Amps/2000-06/msg00236.html (7,371 bytes)
42. [AMPS] Capacitor (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 18 Jun 2000 12:21:01 -0700; Paul: By any chance did you pick up that cap at HamCom last weekend? I saw something like you describe there. I believe they were mylar dielectric foil jobs. If so, they probably have resonance probl; /archives//html/Amps/2000-06/msg00243.html (9,738 bytes)
43. [AMPS] Talking SB-200 (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 21 Jun 2000 10:59:07 -0700; Steve: I have run across at least one ceramic doorknob cap that "talked" as I did. Believe it was one of the CRL .001mfd jobs. Replaced it with another one and no such problem. I think the material u; /archives//html/Amps/2000-06/msg00301.html (8,708 bytes)
44. [AMPS] Solid State Relays (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 25 Jun 2000 11:34:00 -0700; I once did a measurement of line voltage transients in an industrial laboratory over a 24 hr period using a special transient recorder which counted the number and sorted them by amplitude. There wer; /archives//html/Amps/2000-06/msg00382.html (8,566 bytes)
45. [AMPS] re[amps]Power Handling Capability of Coax Cable (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 05 May 2000 15:51:17 -0700; There was an article in QST some 10 years ago or so concerning losses in coax cable. I believe the author was employed at Amphenol but not sure. I was interested in his statemant that the dominant lo; /archives//html/Amps/2000-05/msg00073.html (7,082 bytes)
46. [AMPS] Plate Choke Inductance (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 16 Apr 2000 22:07:27 -0700; Dave: The answer to your question is, I believe, the choke impedance should be as high as you can make it. Typical R.F. chokes have series and parallel resonances which must be dealt with. A parallel; /archives//html/Amps/2000-04/msg00081.html (7,725 bytes)
47. [AMPS] Globar Resistors (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 04 Mar 2000 14:38:29 -0800; I have been using these resistors in parasitic suppressors for many years . Has anyone ever had one of these fail or change value without a change in external appearance? -- FAQ on WWW: http://www.co; /archives//html/Amps/2000-03/msg00130.html (7,535 bytes)
48. [AMPS] Big Bang Problem (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 05 Mar 2000 11:28:01 -0800; You hit the nail on the head, Phil. Excellent summary. -- Allow me to suggest several factors that have exacerbated the "big bang" problem over the years. !. The scaling down problem. Sacrificing fai; /archives//html/Amps/2000-03/msg00171.html (9,158 bytes)
49. [AMPS] Rocky Point effects (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 08 Mar 2000 16:54:19 -0800; I have been waiting patiently for someone to mention Rocky Point effect in connection with "big bangs" in linear amplifiers. Tom finally brought up the subject with a very interesting post. I first h; /archives//html/Amps/2000-03/msg00490.html (10,180 bytes)
50. [AMPS] Receiver Performance (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 13 Mar 2000 13:09:37 -0800; The recent posting of receiver test results was very interesting to me. I have been testing receiver performance for more than 10 years using a home built test set consisting of 2 filtered,shielded x; /archives//html/Amps/2000-03/msg00641.html (10,766 bytes)
51. [AMPS] Clipperton-L input>150watts? (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 01 Feb 2000 18:45:07 -0800; Jonathan: The 751 should put out a maximum of 100 watts. This can be set with an internal potentiometer adjustment on most radios to the correct value. At 100 watts out the IMD distortion will be acc; /archives//html/Amps/2000-02/msg00004.html (8,578 bytes)
52. [AMPS] Noise Nullers (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 05 Feb 2000 16:58:17 -0800; I promised several weeks ago to share information which I have on Noise Nullers if there was interest. Several people asked me to post it. Since I do not have a scanner, Larry Molitar, W7IUV offered; /archives//html/Amps/2000-02/msg00076.html (6,921 bytes)
53. [AMPS] RF Choke Forms (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 15 Jan 2000 06:08:13 -0800; The handbook "Reference Data For Engineers" by ITT, has a table showing D factor loss for many plastic and ceramic materials for frequencies between 60 hz and the microwave range in 6 steps. It also; /archives//html/Amps/2000-01/msg00311.html (8,851 bytes)
54. [AMPS] Noise Nullers (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 16 Jan 2000 22:02:13 -0800; Several postings on this reflector indicate an interest in learning about these devices. I have used the S.E.M. and ANC-4 units and have built one of my own design.None of the commercial units are pr; /archives//html/Amps/2000-01/msg00368.html (7,319 bytes)
55. [AMPS] PA-77 question, round two (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 11 Sep 1999 11:38:21 -0700; Jack:I own a 77DX and was concerned that a grid current of about 100ma is needed to develop the legal limit output.A change of tubes resulted in the same result. I posted a query on Amps about other; /archives//html/Amps/1999-09/msg00087.html (14,214 bytes)
56. [AMPS] Doorknob Capacitor Questions (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 08 Aug 1999 11:07:39 -0700; Bill: The current rating varies depending on capacitance value. Lowest is 0.84 amps for the 850s-25z. 1.7 amps for the -50z and -50N--2.5 amps for the -75N--3.4 amps for the -100N--1.1 amps for the 5; /archives//html/Amps/1999-08/msg00161.html (9,267 bytes)
57. [AMPS] RJ-iA relay contact-life on CW? (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 03 Jul 1999 13:57:49 -0700; Rich: I recall reading an article on the W2PV contest station a number of years back which mentioned that they had trouble over time with the RJ1A vac relays in their Alpha 77 amps doing QSK. I don't; /archives//html/Amps/1999-07/msg00023.html (8,918 bytes)
58. [AMPS] Slam Talley (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 09 Jun 1999 10:33:36 -0700; I second that. Anyone who reads Amps knows that: 1. Rich is correct that resistor power dissipation is I squared R. 2. Jon has FINALLY figured out what we all observed in his initial posting on this; /archives//html/Amps/1999-06/msg00299.html (8,386 bytes)
59. [AMPS] Slam Talley (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 09 Jun 1999 10:42:48 -0700; Sorry fellows for mixing two subjects. Still agree with Marv's comment but was thinking about the the ridiculous resistor dissipation discussion. Will try to be more careful next time. -- FAQ on WWW:; /archives//html/Amps/1999-06/msg00300.html (8,052 bytes)
60. [AMPS] Intermittent 8874 (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 15 Jun 1999 12:40:15 -0700; Hi Jeff : Do the socket contacts have plenty of spring action to grip the tube pin ? If not, they get hot and lose their tension. I have had trouble with this in the past. RCA phono connectors freque; /archives//html/Amps/1999-06/msg00462.html (8,398 bytes)

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